and silicone,, flexible, and safe to use Non-stick silicone molds easily releases shape, molds wonot Just pour the resin into the mold and wait for it to cool, then you will get a intact finished decoration with complete-structure no sticking and no tearing, no need extra-cutting and edging, very friendly to beginners Our epoxy resin silicone mold can be used to make rings, pendants, earrings, keychains, jewelry Wonderful gift, sweet warm friend family wife, girlfriend, wife